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calc.go
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calc.go
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/*
Copyright © 2023-2024 Thomas von Dein
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"errors"
"fmt"
"math"
"regexp"
"sort"
"strconv"
"strings"
"github.com/chzyer/readline"
)
type Calc struct {
debug bool
batch bool
stdin bool
showstack bool
intermediate bool
notdone bool // set to true as long as there are items left in the eval loop
precision int
stack *Stack
history []string
completer readline.AutoCompleter
interpreter *Interpreter
Space *regexp.Regexp
Comment *regexp.Regexp
Register *regexp.Regexp
Constants []string
LuaFunctions []string
Funcalls Funcalls
BatchFuncalls Funcalls
// different kinds of commands, displays nicer in help output
StackCommands Commands
SettingsCommands Commands
ShowCommands Commands
Commands Commands
Vars map[string]float64
}
// help for lua functions will be added dynamically
const Help string = `
Operators:
basic operators: + - x * / ^ (* is an alias of x)
Bitwise operators: and or xor < (left shift) > (right shift)
Percent functions:
% percent
%- subtract percent
%+ add percent
Math functions (see https://pkg.go.dev/math):
mod sqrt abs acos acosh asin asinh atan atan2 atanh cbrt ceil cos cosh
erf erfc erfcinv erfinv exp exp2 expm1 floor gamma ilogb j0 j1 log
log10 log1p log2 logb pow round roundtoeven sin sinh tan tanh trunc y0
y1 copysign dim hypot
Batch functions:
sum sum of all values (alias: +)
max max of all values
min min of all values
mean mean of all values (alias: avg)
median median of all values
Register variables:
>NAME Put last stack element into variable NAME
<NAME Retrieve variable NAME and put onto stack`
// commands, constants and operators, defined here to feed completion
// and our mode switch in Eval() dynamically
const (
Constants string = `Pi Phi Sqrt2 SqrtE SqrtPi SqrtPhi Ln2 Log2E Ln10 Log10E`
Precision int = 2
ShowStackLen int = 5
)
// That way we can add custom functions to completion
func GetCompleteCustomFunctions() func(string) []string {
return func(line string) []string {
completions := []string{}
for luafunc := range LuaFuncs {
completions = append(completions, luafunc)
}
completions = append(completions, strings.Split(Constants, " ")...)
return completions
}
}
func (c *Calc) GetCompleteCustomFuncalls() func(string) []string {
return func(line string) []string {
completions := []string{}
for function := range c.Funcalls {
completions = append(completions, function)
}
for function := range c.BatchFuncalls {
completions = append(completions, function)
}
for command := range c.SettingsCommands {
if len(command) > 1 {
completions = append(completions, command)
}
}
for command := range c.ShowCommands {
if len(command) > 1 {
completions = append(completions, command)
}
}
for command := range c.StackCommands {
if len(command) > 1 {
completions = append(completions, command)
}
}
for command := range c.Commands {
if len(command) > 1 {
completions = append(completions, command)
}
}
return completions
}
}
func NewCalc() *Calc {
calc := Calc{stack: NewStack(), debug: false, precision: Precision}
calc.Funcalls = DefineFunctions()
calc.BatchFuncalls = DefineBatchFunctions()
calc.Vars = map[string]float64{}
calc.completer = readline.NewPrefixCompleter(
// custom lua functions
readline.PcItemDynamic(GetCompleteCustomFunctions()),
readline.PcItemDynamic(calc.GetCompleteCustomFuncalls()),
)
calc.Space = regexp.MustCompile(`\s+`)
calc.Comment = regexp.MustCompile(`#.*`) // ignore everything after #
calc.Register = regexp.MustCompile(`^([<>])([A-Z][A-Z0-9]*)`)
// pre-calculate mode switching arrays
calc.Constants = strings.Split(Constants, " ")
calc.SetCommands()
return &calc
}
// setup the interpreter, called from main(), import lua functions
func (c *Calc) SetInt(interpreter *Interpreter) {
c.interpreter = interpreter
for name := range LuaFuncs {
c.LuaFunctions = append(c.LuaFunctions, name)
}
}
func (c *Calc) ToggleDebug() {
c.debug = !c.debug
c.stack.ToggleDebug()
fmt.Printf("debugging set to %t\n", c.debug)
}
func (c *Calc) ToggleBatch() {
c.batch = !c.batch
fmt.Printf("batchmode set to %t\n", c.batch)
}
func (c *Calc) ToggleStdin() {
c.stdin = !c.stdin
}
func (c *Calc) ToggleShow() {
c.showstack = !c.showstack
}
func (c *Calc) Prompt() string {
prompt := "\033[31m»\033[0m "
batch := ""
if c.batch {
batch = "->batch"
}
debug := ""
revision := ""
if c.debug {
debug = "->debug"
revision = fmt.Sprintf("/rev%d", c.stack.rev)
}
return fmt.Sprintf("rpn%s%s [%d%s]%s", batch, debug, c.stack.Len(), revision, prompt)
}
// the actual work horse, evaluate a line of calc command[s]
func (c *Calc) Eval(line string) error {
// remove surrounding whitespace and comments, if any
line = strings.TrimSpace(c.Comment.ReplaceAllString(line, ""))
if line == "" {
return nil
}
items := c.Space.Split(line, -1)
for pos, item := range items {
if pos+1 < len(items) {
c.notdone = true
} else {
c.notdone = false
}
if err := c.EvalItem(item); err != nil {
return err
}
}
if c.showstack && !c.stdin {
dots := ""
if c.stack.Len() > ShowStackLen {
dots = "... "
}
last := c.stack.Last(ShowStackLen)
fmt.Printf("stack: %s%s\n", dots, list2str(last))
}
return nil
}
func (c *Calc) EvalItem(item string) error {
num, err := strconv.ParseFloat(item, 64)
if err == nil {
c.stack.Backup()
c.stack.Push(num)
return nil
}
// try hex
var i int
_, err = fmt.Sscanf(item, "0x%x", &i)
if err == nil {
c.stack.Backup()
c.stack.Push(float64(i))
return nil
}
if contains(c.Constants, item) {
// put the constant onto the stack
c.stack.Backup()
c.stack.Push(const2num(item))
return nil
}
if exists(c.Funcalls, item) {
if err := c.DoFuncall(item); err != nil {
return Error(err.Error())
}
c.Result()
return nil
}
if exists(c.BatchFuncalls, item) {
if !c.batch {
return Error("only supported in batch mode")
}
if err := c.DoFuncall(item); err != nil {
return Error(err.Error())
}
c.Result()
return nil
}
if contains(c.LuaFunctions, item) {
// user provided custom lua functions
c.EvalLuaFunction(item)
return nil
}
regmatches := c.Register.FindStringSubmatch(item)
if len(regmatches) == 3 {
switch regmatches[1] {
case ">":
c.PutVar(regmatches[2])
case "<":
c.GetVar(regmatches[2])
}
return nil
}
// internal commands
// FIXME: propagate errors
if exists(c.Commands, item) {
c.Commands[item].Func(c)
return nil
}
if exists(c.ShowCommands, item) {
c.ShowCommands[item].Func(c)
return nil
}
if exists(c.StackCommands, item) {
c.StackCommands[item].Func(c)
return nil
}
if exists(c.SettingsCommands, item) {
c.SettingsCommands[item].Func(c)
return nil
}
switch item {
case "?":
fallthrough
case "help":
c.PrintHelp()
default:
return Error("unknown command or operator")
}
return nil
}
// Execute a math function, check if it is defined just in case
func (c *Calc) DoFuncall(funcname string) error {
var function *Funcall
if c.batch {
function = c.BatchFuncalls[funcname]
} else {
function = c.Funcalls[funcname]
}
if function == nil {
return Error("function not defined but in completion list")
}
var args Numbers
batch := false
if function.Expectargs == -1 {
// batch mode, but always < stack len, so check first
args = c.stack.All()
batch = true
} else {
// this is way better behavior than just using 0 in place of
// non-existing stack items
if c.stack.Len() < function.Expectargs {
return errors.New("stack doesn't provide enough arguments")
}
args = c.stack.Last(function.Expectargs)
}
c.Debug(fmt.Sprintf("calling %s with args: %v", funcname, args))
// the actual lambda call, so to say. We provide a slice of
// the requested size, fetched from the stack (but not popped
// yet!)
funcresult := function.Func(args)
if funcresult.Err != nil {
// leave the stack untouched in case of any error
return funcresult.Err
}
// don't forget to backup!
c.stack.Backup()
// "pop"
if batch {
// get rid of stack
c.stack.Clear()
} else {
// remove operands
c.stack.Shift(function.Expectargs)
}
// save result
c.stack.Push(funcresult.Res)
// thanks a lot
c.SetHistory(funcname, args, funcresult.Res)
return nil
}
// we need to add a history entry for each operation
func (c *Calc) SetHistory(op string, args Numbers, res float64) {
c.History("%s %s -> %f", list2str(args), op, res)
}
// just a textual representation of math operations, viewable with the
// history command
func (c *Calc) History(format string, args ...any) {
c.history = append(c.history, fmt.Sprintf(format, args...))
}
// print the result
func (c *Calc) Result() float64 {
// we only print the result if it's either a final result or
// (if it is intermediate) if -i has been given
if c.intermediate || !c.notdone {
// only needed in repl
if !c.stdin {
fmt.Print("= ")
}
result := c.stack.Last()[0]
truncated := math.Trunc(result)
precision := c.precision
if result == truncated {
precision = 0
}
format := fmt.Sprintf("%%.%df\n", precision)
fmt.Printf(format, result)
}
return c.stack.Last()[0]
}
func (c *Calc) Debug(msg string) {
if c.debug {
fmt.Printf("DEBUG(calc): %s\n", msg)
}
}
func (c *Calc) EvalLuaFunction(funcname string) {
// called from calc loop
var luaresult float64
var err error
switch c.interpreter.FuncNumArgs(funcname) {
case 0:
fallthrough
case 1:
luaresult, err = c.interpreter.CallLuaFunc(funcname, c.stack.Last())
case 2:
luaresult, err = c.interpreter.CallLuaFunc(funcname, c.stack.Last(2))
case -1:
luaresult, err = c.interpreter.CallLuaFunc(funcname, c.stack.All())
default:
luaresult, err = 0, errors.New("invalid number of argument requested")
}
if err != nil {
fmt.Println(err)
return
}
c.stack.Backup()
dopush := true
switch c.interpreter.FuncNumArgs(funcname) {
case 0:
a := c.stack.Last()
if len(a) == 1 {
c.History("%s(%f) = %f", funcname, a, luaresult)
}
dopush = false
case 1:
a := c.stack.Pop()
c.History("%s(%f) = %f", funcname, a, luaresult)
case 2:
a := c.stack.Pop()
b := c.stack.Pop()
c.History("%s(%f,%f) = %f", funcname, a, b, luaresult)
case -1:
c.stack.Clear()
c.History("%s(*) = %f", funcname, luaresult)
}
if dopush {
c.stack.Push(luaresult)
}
c.Result()
}
func (c *Calc) PutVar(name string) {
last := c.stack.Last()
if len(last) == 1 {
c.Debug(fmt.Sprintf("register %.2f in %s", last[0], name))
c.Vars[name] = last[0]
} else {
fmt.Println("empty stack")
}
}
func (c *Calc) GetVar(name string) {
if exists(c.Vars, name) {
c.Debug(fmt.Sprintf("retrieve %.2f from %s", c.Vars[name], name))
c.stack.Backup()
c.stack.Push(c.Vars[name])
} else {
fmt.Println("variable doesn't exist")
}
}
func sortcommands(hash Commands) []string {
keys := make([]string, 0, len(hash))
for key := range hash {
if len(key) > 1 {
keys = append(keys, key)
}
}
sort.Strings(keys)
return keys
}
func (c *Calc) PrintHelp() {
fmt.Println("Available configuration commands:")
for _, name := range sortcommands(c.SettingsCommands) {
fmt.Printf("%-20s %s\n", name, c.SettingsCommands[name].Help)
}
fmt.Println()
fmt.Println("Available show commands:")
for _, name := range sortcommands(c.ShowCommands) {
fmt.Printf("%-20s %s\n", name, c.ShowCommands[name].Help)
}
fmt.Println()
fmt.Println("Available stack manipulation commands:")
for _, name := range sortcommands(c.StackCommands) {
fmt.Printf("%-20s %s\n", name, c.StackCommands[name].Help)
}
fmt.Println()
fmt.Println("Other commands:")
for _, name := range sortcommands(c.Commands) {
fmt.Printf("%-20s %s\n", name, c.Commands[name].Help)
}
fmt.Println()
fmt.Println(Help)
// append lua functions, if any
if len(LuaFuncs) > 0 {
fmt.Println("Lua functions:")
for name, function := range LuaFuncs {
fmt.Printf("%-20s %s\n", name, function.help)
}
}
}